diff --git a/app/models/event_schedule.rb b/app/models/event_schedule.rb
index 01f80b51..bdbcd948 100644
--- a/app/models/event_schedule.rb
+++ b/app/models/event_schedule.rb
@@ -27,7 +27,7 @@ class EventSchedule < ApplicationRecord
 
   delegate :guid, to: :room, prefix: true
 
-  delegate :timezone, to: event
+  delegate :timezone, to: :event
 
   ##
   # True within 1 hour before and after the event.